Stencil



Dec. 1.3, 1938. A E 'SCHUTTE 2,140,483

STENCIL Filed Dec. 13, 1955 Mn.. 1.". n...

INVENTOR 4061/575 'c'f/z/rrf BY R LL) e bwk Aa. ,21,

ATTORNEY Patented Dec. 13, 1.938 i y l -,UN'1TED sTATEsPATENT oFFlcI-zSTENCIL August E. Schutte, Northboro, Mass., assigner to A. B. DickCompany, Chicago, Ill., a corporation of Illinois Application December13, .1935, serial No. 54,242 s claims. (o1. 10i-121) This inventionrelates tothe art of duplicating, 1 `of the type, offset from the planeof the illm and provides an improved stencil. l 4 and a plurality ofminute perfrations 9 are In the past, stencils have commonly been madeformed in that offset area by the projecting granthrough perforating orcutting holesin a sheet ules l0 of sand. I The face of the resultantstencil 5 which had been treated so that it was generally has localembossed areas Il, which correspond impervious to ink, or by expressingparts of a to the indentations 8 caused by the type 1, and fluentink-impervious coating or impregnating which have a plurality of minuteperforations 9 composition which had been applied to an open, throughwhich ink may pass. The stencil thus lace-like tissue. A particularobject of my inmade may be placed in a duplicating machine in 10 ventionis the production of a stencil, made the ordinary manner, with theindented side next 10 through periorating` an ink-impervious film, tothe ink pad, and, when copy paper is placed which is cheap and durableand not affected by upon the stencil, ink can be forced into theinclimatic conditions. dentations 8 and through Ithe perforations 9 tothe I have discovered that such a stencil may be copy paper. made from asheet of cellulosic material of the Through the use of abacking havingiine, close- 15 type commonly known as Cellophane Such 1y spacedprojections I0 on its surface, the dots a sheet is av tough, ilexible,homogeneous, semiof ink which pass through adjacent perforationsplastic, non-brous film which is impervious to, 9 may meet to form acontinuous outline for the and not injuriously affected by, the inkscommoncharacter written but ,the centers of the loop ly used induplicating. In accordance with my letters will not be cut out and, as aresult of the 20 invention, local areasof such a sheet are forced, factthat only those portions 'of the lm 4 which as by the blow of the typeof a typewriter, against are struck bythe type l are oiset from theplane` a surface having closely spaced, hard, fine proof the lm, onlythe offset or embossed portions jections. That portionV of the lm whichis struck I I of the film 4 will be forced against the backing by a typeis indented over an area corresponding v5 with sufficient'force for thegranules of sand 25 to the face of the type, and is offset from the I0to perforate the film 4, so that the outlines of .l plane of the film.The projections from thew surthe characters formed on the prints madethrough 0 face against which the iilm is struck'provide that such astencil will be clearer and sharper than oiset portion with a pluralityof minute perforawould otherwise be the case. 00 tions throughwhich inkmay pass. D What is claimed is: 30

A specific embodiment of my invention is il` 1. A stencil, comprising agenerally ink-imlustrated in the accompanying'drawing, in which:pervious, homogeneous, semi-plastic, non-fibrous, g Fig. 1 is a planView of a stencil made in accellulosic sheet containing local areascorrespondcordance with my invention, broken away in part. 'ingrespectively to the various characters formed to show the sandpaperbacking; by 'a typewriter or the like and each having a 35 Fig. 2 is anenlarged section illustrating the plurality of minute perforationsthrough which formation of a character in the4 stencil-sheet ink maypass.

when it is struck by the face of the type; and 2. A stencil, comprisinga generally ink-im- Fig. 3 is an enlarged view of a character formedpervious, homogeneous, Y semi-plastic, iiexible, 40 yin thestencil-sheet as illustrated in Fig. 2. non-fibrous, cellulosic sheetcontaining local o A convenient method of making a stencil em-l areasindented to form oiset portions having a, bodying myiinvention consistsin placing a sheet plurality of minute perforations through which 4 ofnon-bousellulosic plastic-of thetype com- ,ink may pass.

monly mar`etedr-under the name Cellophane 3. A stencil, comprising agenerally ink-imover a sheet of fine sandpaper 5 and typing on itpervious, homogeneous, semi-plastic, ilexible, 45 in a typewriteragainst the sandpaper 5. non-iibrous,.cellulosic sheet containing localem- Each portion of the sheet 4 which is struck 'bossed areashavingaplurality of minute perforaby a type-face l is indented to form alocal tions through whichinkmay pass.' portion 8. which corresponds inarea to the face AUGUST E. SCHU'I'IE.v

